src/lib/dcp_decoder.cc

   1 /*
   2     Copyright (C) 2014-2016 Carl Hetherington <cth@carlh.net>
   3
   4     This file is part of DCP-o-matic.
   5
   6     DCP-o-matic is free software; you can redistribute it and/or modify
   7     it under the terms of the GNU General Public License as published by
   8     the Free Software Foundation; either version 2 of the License, or
   9     (at your option) any later version.
  10
  11     DCP-o-matic is distributed in the hope that it will be useful,
  12     but WITHOUT ANY WARRANTY; without even the implied warranty of
  13     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14     GNU General Public License for more details.
  15
  16     You should have received a copy of the GNU General Public License
  17     along with DCP-o-matic.  If not, see <http://www.gnu.org/licenses/>.
  18
  19 */
  20
  21 #include "dcp_decoder.h"
  22 #include "dcp_content.h"
  23 #include "audio_content.h"
  24 #include "video_decoder.h"
  25 #include "audio_decoder.h"
  26 #include "j2k_image_proxy.h"
  27 #include "subtitle_decoder.h"
  28 #include "image.h"
  29 #include "config.h"
  30 #include <dcp/dcp.h>
  31 #include <dcp/cpl.h>
  32 #include <dcp/reel.h>
  33 #include <dcp/mono_picture_asset.h>
  34 #include <dcp/mono_picture_asset_reader.h>
  35 #include <dcp/stereo_picture_asset.h>
  36 #include <dcp/stereo_picture_asset_reader.h>
  37 #include <dcp/reel_picture_asset.h>
  38 #include <dcp/reel_sound_asset.h>
  39 #include <dcp/reel_subtitle_asset.h>
  40 #include <dcp/mono_picture_frame.h>
  41 #include <dcp/stereo_picture_frame.h>
  42 #include <dcp/sound_frame.h>
  43 #include <dcp/sound_asset_reader.h>
  44 #include <boost/foreach.hpp>
  45 #include <iostream>
  46
  47 using std::list;
  48 using std::cout;
  49 using boost::shared_ptr;
  50 using boost::dynamic_pointer_cast;
  51
  52 DCPDecoder::DCPDecoder (shared_ptr<const DCPContent> c, shared_ptr<Log> log)
  53         : DCP (c)
  54         , _decode_referenced (false)
  55 {
  56         video.reset (new VideoDecoder (this, c, log));
  57         audio.reset (new AudioDecoder (this, c->audio, log));
  58
  59         subtitle.reset (new SubtitleDecoder (this, c->subtitle, log));
  60
  61         shared_ptr<dcp::CPL> cpl;
  62         BOOST_FOREACH (shared_ptr<dcp::CPL> i, cpls ()) {
  63                 if (_dcp_content->cpl() && i->id() == _dcp_content->cpl().get()) {
  64                         cpl = i;
  65                 }
  66         }
  67
  68         if (!cpl) {
  69                 /* No CPL found; probably an old file that doesn't specify it;
  70                    just use the first one.
  71                 */
  72                 cpl = cpls().front ();
  73         }
  74
  75         _reels = cpl->reels ();
  76
  77         _reel = _reels.begin ();
  78         _offset = 0;
  79         get_readers ();
  80 }
  81
  82 void
  83 DCPDecoder::pass ()
  84 {
  85         if (_reel == _reels.end () || !_dcp_content->can_be_played ()) {
  86                 return;
  87         }
  88
  89         double const vfr = _dcp_content->active_video_frame_rate ();
  90
  91         /* Frame within the (played part of the) reel that is coming up next */
  92         int64_t const frame = _next.frames_round (vfr);
  93
  94         if ((_mono_reader || _stereo_reader) && (_decode_referenced || !_dcp_content->reference_video())) {
  95                 shared_ptr<dcp::PictureAsset> asset = (*_reel)->main_picture()->asset ();
  96                 int64_t const entry_point = (*_reel)->main_picture()->entry_point ();
  97                 if (_mono_reader) {
  98                         video->emit (
  99                                 shared_ptr<ImageProxy> (
 100                                         new J2KImageProxy (_mono_reader->get_frame (entry_point + frame), asset->size(), AV_PIX_FMT_XYZ12LE)
 101                                         ),
 102                                 _offset + frame
 103                                 );
 104                 } else {
 105                         video->emit (
 106                                 shared_ptr<ImageProxy> (
 107                                         new J2KImageProxy (_stereo_reader->get_frame (entry_point + frame), asset->size(), dcp::EYE_LEFT, AV_PIX_FMT_XYZ12LE)),
 108                                 _offset + frame
 109                                 );
 110
 111                         video->emit (
 112                                 shared_ptr<ImageProxy> (
 113                                         new J2KImageProxy (_stereo_reader->get_frame (entry_point + frame), asset->size(), dcp::EYE_RIGHT, AV_PIX_FMT_XYZ12LE)),
 114                                 _offset + frame
 115                                 );
 116                 }
 117         }
 118
 119         if (_sound_reader && (_decode_referenced || !_dcp_content->reference_audio())) {
 120                 int64_t const entry_point = (*_reel)->main_sound()->entry_point ();
 121                 shared_ptr<const dcp::SoundFrame> sf = _sound_reader->get_frame (entry_point + frame);
 122                 uint8_t const * from = sf->data ();
 123
 124                 int const channels = _dcp_content->audio->stream()->channels ();
 125                 int const frames = sf->size() / (3 * channels);
 126                 shared_ptr<AudioBuffers> data (new AudioBuffers (channels, frames));
 127                 float** data_data = data->data();
 128                 for (int i = 0; i < frames; ++i) {
 129                         for (int j = 0; j < channels; ++j) {
 130                                 data_data[j][i] = static_cast<int> ((from[0] << 8) | (from[1] << 16) | (from[2] << 24)) / static_cast<float> (INT_MAX - 256);
 131                                 from += 3;
 132                         }
 133                 }
 134
 135                 audio->emit (_dcp_content->audio->stream(), data, ContentTime::from_frames (_offset, vfr) + _next);
 136         }
 137
 138         if ((*_reel)->main_subtitle() && (_decode_referenced || !_dcp_content->reference_subtitle())) {
 139                 int64_t const entry_point = (*_reel)->main_subtitle()->entry_point ();
 140                 list<dcp::SubtitleString> subs = (*_reel)->main_subtitle()->asset()->subtitles_during (
 141                         dcp::Time (entry_point + frame, vfr, vfr),
 142                         dcp::Time (entry_point + frame + 1, vfr, vfr),
 143                         true
 144                         );
 145
 146                 if (!subs.empty ()) {
 147                         /* XXX: assuming that all `subs' are at the same time; maybe this is ok */
 148                         subtitle->emit_text (
 149                                 ContentTimePeriod (
 150                                         ContentTime::from_frames (_offset - entry_point, vfr) + ContentTime::from_seconds (subs.front().in().as_seconds ()),
 151                                         ContentTime::from_frames (_offset - entry_point, vfr) + ContentTime::from_seconds (subs.front().out().as_seconds ())
 152                                         ),
 153                                 subs
 154                                 );
 155                 }
 156         }
 157
 158         _next += ContentTime::from_frames (1, vfr);
 159
 160         if ((*_reel)->main_picture ()) {
 161                 if (_next.frames_round (vfr) >= (*_reel)->main_picture()->duration()) {
 162                         next_reel ();
 163                         _next = ContentTime ();
 164                 }
 165         }
 166 }
 167
 168 void
 169 DCPDecoder::next_reel ()
 170 {
 171         _offset += (*_reel)->main_picture()->duration();
 172         ++_reel;
 173         get_readers ();
 174 }
 175
 176 void
 177 DCPDecoder::get_readers ()
 178 {
 179         if (_reel == _reels.end() || !_dcp_content->can_be_played ()) {
 180                 _mono_reader.reset ();
 181                 _stereo_reader.reset ();
 182                 _sound_reader.reset ();
 183                 return;
 184         }
 185
 186         if ((*_reel)->main_picture()) {
 187                 shared_ptr<dcp::PictureAsset> asset = (*_reel)->main_picture()->asset ();
 188                 shared_ptr<dcp::MonoPictureAsset> mono = dynamic_pointer_cast<dcp::MonoPictureAsset> (asset);
 189                 shared_ptr<dcp::StereoPictureAsset> stereo = dynamic_pointer_cast<dcp::StereoPictureAsset> (asset);
 190                 DCPOMATIC_ASSERT (mono || stereo);
 191                 if (mono) {
 192                         _mono_reader = mono->start_read ();
 193                         _stereo_reader.reset ();
 194                 } else {
 195                         _stereo_reader = stereo->start_read ();
 196                         _mono_reader.reset ();
 197                 }
 198         } else {
 199                 _mono_reader.reset ();
 200                 _stereo_reader.reset ();
 201         }
 202
 203         if ((*_reel)->main_sound()) {
 204                 _sound_reader = (*_reel)->main_sound()->asset()->start_read ();
 205         } else {
 206                 _sound_reader.reset ();
 207         }
 208 }
 209
 210 void
 211 DCPDecoder::seek (ContentTime t, bool)
 212 {
 213         _reel = _reels.begin ();
 214         _offset = 0;
 215         get_readers ();
 216
 217         while (_reel != _reels.end() && t >= ContentTime::from_frames ((*_reel)->main_picture()->duration(), _dcp_content->active_video_frame_rate ())) {
 218                 t -= ContentTime::from_frames ((*_reel)->main_picture()->duration(), _dcp_content->active_video_frame_rate ());
 219                 next_reel ();
 220         }
 221
 222         _next = t;
 223 }
 224
 225 void
 226 DCPDecoder::set_decode_referenced ()
 227 {
 228         _decode_referenced = true;
 229 }